package com.atguigu.flink.chapter07;

import com.atguigu.flink.bean.WaterSensor;
import com.atguigu.flink.util.AtguiguUtil;
import org.apache.flink.api.common.eventtime.*;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.windowing.ProcessWindowFunction;
import org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.streaming.api.windowing.windows.TimeWindow;
import org.apache.flink.util.Collector;

import java.util.List;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/9/17 9:24
 */
public class Flink10_Watermark_Custom {
    
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 20000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);
    
        env.getConfig().setAutoWatermarkInterval(3000);
        env
            .socketTextStream("hadoop162", 9999)
            .map(line -> {
                String[] data = line.split(",");
                return new WaterSensor(data[0], Long.valueOf(data[1]), Integer.valueOf(data[2]));
            })
            .assignTimestampsAndWatermarks(
                WatermarkStrategy
                    .<WaterSensor>forGenerator(new WatermarkStrategy<WaterSensor>() {
                        @Override
                        public WatermarkGenerator<WaterSensor> createWatermarkGenerator(WatermarkGeneratorSupplier.Context context) {
                            return new MyPeriodWMG();
                        }
                    })
                    .withTimestampAssigner((ws, ts) -> ws.getTs())
            )
            .keyBy(WaterSensor::getId)
            .window(TumblingEventTimeWindows.of(Time.seconds(5)))
            .process(new ProcessWindowFunction<WaterSensor, String, String, TimeWindow>() {
                @Override
                public void process(String key,
                                    Context ctx,
                                    Iterable<WaterSensor> elements,
                                    Collector<String> out) throws Exception {
                    List<WaterSensor> list = AtguiguUtil.toList(elements);
                    
                    String msg = key + "  " + list + "  " + ctx.window();
                    
                    out.collect(msg);
                    
                }
            })
            .print();
        
        try {
            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    public static class MyPeriodWMG implements WatermarkGenerator<WaterSensor> {
        
        private long maxTs = Long.MIN_VALUE + 3000;
        
        @Override
        public void onEvent(WaterSensor event, long eventTimestamp, WatermarkOutput output) {
            System.out.println("MyPeriodWMG.onEvent");
            // 更新最大时间戳
            maxTs = Math.max(maxTs, eventTimestamp);
            output.emitWatermark(new Watermark(maxTs - 3000));
        }
        
        @Override
        public void onPeriodicEmit(WatermarkOutput output) {
            System.out.println("MyPeriodWMG.onPeriodicEmit");
            // 发射水印
            //output.emitWatermark(new Watermark(maxTs - 3000));
            
        }
    }
    
}
